Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ca9cf92ef49123…

MALICIOUS

PDF

76.1 KB Created: 2021-05-24 18:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3225bf6615249b1cf1c2e4af8d8d9f6f SHA-1: d50d99c04ed3ec5c9c76732b5afa0c8bb9dd0aef SHA-256: f1ca9cf92ef49123a772132c0b116656f1f5286047260ea5b7ac1a856369cc33
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, including a link farm and an SEO redirector pointing to 'https://nipisod.ru/strik?utm_term=dumpper+and+jumpstart+wifi+hacker', which is likely a lure for downloading malware. The document body, though heavily obfuscated, contains references to 'dumpper and jumpstart wifi hacker', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=dumpper+and+jumpstart+wifi+hacker PDF link annotation
    • https://lunogowome.weebly.com/uploads/1/3/4/8/134859941/rizudesisor_guzamotasot_kozupuvopural_varizit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fd7f1d099018.pdfIn PDF document text
    • https://mobakuwi.weebly.com/uploads/1/3/4/4/134404075/ac4f630d11d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_6041c58fe6673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/menozamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06621ab6-53d1-4f07-885e-6d26439f8b36/putuvisexanagatagofekodil.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/codigo_ascii_para_vocales_con_acento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91050990-ca01-478e-9f79-0701d483254b/widemolenu.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/diablo_3_necromancer_inarius_speed_build.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/79144861824.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/bebubewiteladofasebuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9dcd820-f699-4925-b832-d57d0b849a54/kitchenaid_1.9l_stovetop_tea_kettle.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/2009530273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dc0300-ac2c-427c-938f-b8d3c1d5b394/how_to_apply_3m_scotchcal_decals.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/baby_g_shock_manual_5338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a7dea8-edb4-469d-97df-1750ef3450f2/propiedades_fisicas_y_quimicas_de_los_enlaces_ionicos_y_covalentes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d834fe00-d105-46fd-9fb4-44c31aa02614/42059164604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bce19b-fbb9-4ddb-878a-a3cce586e52d/large_iced_caramel_macchiato_dunkin_donuts_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbe0984-c635-4240-9312-86dadab0f7c5/banizu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 5596 bytes
SHA-256: f27b973880d0f47550e23ec2134c2e43ee7d08b48109ccbe6e7dc64d07baf167
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10920 bytes
SHA-256: 7698b47d76ea74e447f096774d85b5d0d80edb67696b7cdb9f4a5de14992e204